/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBoxBuilder.h
void InitializeToolBarButtonBlock ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FToolBarButtonBlock](API\Runtime\Slate\Framework\MultiBox\FToolBarButtonBlock) > ButtonRowBlock, [FButtonArgs](API\Runtime\Slate\Framework\MultiBox\FButtonArgs) & ButtonArgs )